nptl_db/td_thr_tls_get_addr.c

   1 /* Get address of thread local variable.
   2    Copyright (C) 2002-2019 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 2002.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <link.h>
  21 #include "thread_dbP.h"
  22
  23 td_err_e
  24 td_thr_tls_get_addr (const td_thrhandle_t *th,
  25                      psaddr_t map_address, size_t offset, psaddr_t *address)
  26 {
  27   td_err_e err;
  28   psaddr_t modid;
  29
  30   /* Get the TLS module ID from the `struct link_map' in the inferior.  */
  31   err = DB_GET_FIELD (modid, th->th_ta_p, map_address, link_map,
  32                       l_tls_modid, 0);
  33   if (err == TD_NOCAPAB)
  34     return TD_NOAPLIC;
  35   if (err == TD_OK)
  36     {
  37       err = td_thr_tlsbase (th, (uintptr_t) modid, address);
  38       if (err == TD_OK)
  39         *address += offset;
  40     }
  41   return err;
  42 }